A tidal power 'mega project' in one of Europe's iconic waterways could power 1 million homes. But costs are huge

The River Mersey is one of Europe's most iconic waterways. On top of being a major hub for shipbuilding and industry, it's been a source of inspiration for a host of writers, artists and musicians over the years. If all goes to plan, the Mersey could also play a major role in the U.K.'s…

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